Captcha plugin for submission form?

So, I have a classifieds site and one mofo sending a lot of nike and all that shit spam (probably using some program). I don't have any captcha now, basically it is possible to send inquiry without any captchas. But I think it is about time to do something about this and add a captcha on each form, because in the future more mofos are going to send spam like this.

So basically I need to upload that "recaptchalib.php" file to my theme folder where my files are, and later open that file (that form code file) and add those lines mentioned below on that page? The rest I understand how to edit those lines with my keys, etc...

So basically I need to upload that "recaptchalib.php" file to my theme folder where my files are, and later open that file (that form code file) and add those lines mentioned below on that page? The rest I understand how to edit those lines with my keys, etc...

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